MOSCOW (Reuters) - Animals at a Russian zoo have started mating early this year because of steamy temperatures in the warmest Russian winter for a generation, zoo officials said on Wednesday. Temperatures have recently fallen to more arctic norms, but the unusual heat allowed pumas and camels to shrug off the winter blues and start frolicking early. "Some animals have started their mating season early this year because of the warm winter," Maxim Kozlov, the curator at Ivanovo Zoo, north-east of Moscow, told Reuters by telephone. Russia's spectacular winters came to an end this year in European Russia with little...